Valve for internal-combustion engines.



I. B. MARVIN.

VALVE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION msn MAI/18,1915.

1 ,206237. Patented Nov. 28, 1916.

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J. B. MARI/IN. VALVE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY I8, 1915- oon \\\N\ Q\\ QIIIIL MW 2 n @N n0 UNITED sTATEs PATENT oEEIoE.

y.IosEIII E. MARVIN, or MALcoI/r, IOWA.

VALVE FOR INTERNAL-COMBUSTION ENGINES.

Appli-cation filed May 18, 1915.

To all whom it may concern Be it known that I, JOSEPH B. MARVIN, a citizen of the United States, and resident of Malcom, in the county of Poweshiek and State of Iowa., have invented a. certain new and useful-Valve for Internal-Combustion Engines, of which the following is a? speciication.

The object of my invention is to provide a valve of simple durable and inexpensive construction, particularly adapted for use with internal combustion engines.

A further object is'to provide a valve of the rgeneral kind mentioned adapted to slide, and so vmounted and arranged as to` automatically take up wear, so that the valve will always be properly seated.

A further object is to provide a valve so mounted and arranged that the valve may be operated from a crank without the use of push rods or cams.

My invention consists in the construction, combination and arrangement, of the various parts of the device whereby the objects contemplated are attained, as hereinafter more fully set forth pointed out inv my claims and illustrated in the accompanying drawings, ink which:

Figure 1 shows a side elevation of'an engine partly in section taken on theline 1-1 of Fig. 2. Fig. 2 shows a vertical sectional view taken on the line 2-2 of Fig. 1. Fig. 3 shows a top or plan-view of the engine partly in section taken on the line 3-3 of Fig. 4, and Fig. 4 shows a vertical sectional view of the engine cylinder.

In the accompanying drawings, I have used the reference numeral 10. to indicate generally the engine base above which is mounted the cylinder 11, having the water jacket 12. In the cylinder 11 is a. recipro-Y cating piston 13. with the piston 13 is a piston 14 which is pivoted on the crank shaft 15. On the crank shaft 15 is a fly wheel 16. On the other end of the crank shaft 15 is a gear 17 in mesh with a gear 18 on a countershaft 19. The countershaft 19 is formed with a crank 20.

The exhaust and intake chambers of my improved engine are built in substantially the same way, and only one therefore, with the Valve therein will be herein described.

In Fig. 4, I have illustrated the intake chamber 21 connected with which is the intake tube 22. A passage 23 communicates Specification of Letters Patent.

Operatively connected Patented Nov. 28-1916. Serial No. 28,970.

valve 25 comprises thesides A which are Y inclined outwardly from 4the cylinder slightly toward each other, and are connected by a vertical member BV seated on the boss .or seat 24. The valve is 'provided with top andV bottom members 26, in which is mounted the upper end of a valve stem 27 The openings 28 in the members 26 are of proper size to permit some lateral play of the valve with relation to the stem. VThe stem 27 is slidably mounted in the lower wall of the chamber 21. Screwed into the lower end of the chamber 21 is a. plug 29 between which in the chamber-'21 is suitable packing 30. The stem 27 extends slidably through the plug 29 as shown in Fig. 4. A spring 31 engages the cuter wall B `of the valve 25 and also engages the upper end vof the stem 27 for yieldingly holding the wal-l B in engagement with the bosser seat 24.

Y A'Ihe lowerV end of the stem 27 is Vpivotedto Va link .32'which is pivotedto a crankpin'33 of the crank 2O on the shaft 19. It will'thus be seen that when the engine is operated the shaft 19 will be rotated for reciprocating the be seen that as the valve is actuated and the i side walls of the chamber 21 are worn, the boss 24 will also be worn, as the frictional area of said boss is considerably less than the inclined side members. A tight joint will' always be maintained between'the member B and the boss 24. As the boss will not wear any faster than the inclined wall member, the weight or pressure of the valve will, therefore, be carried by the inclined wall members, but at the same time a gas tight joint will be maintained between the boss 24 and the member B of the valve.

Where a valve of this type is used, a single valve stein may be employed operated from a crank and it is not necessary to use the ordinary cams and push rods. On account of the construction just described, the knocking and rattling which usually occurs in an engine after it has been used for some time where the engine is of the type employing cams, is almost entirely eliminated. Another advantage inherent in the valve and operating mechanism heretofore described, is found in the fact that a single packing may be employed for the valve stem, whereas in the ordinary type of engine using cams and push rods, at least two packings are necessary. A

It will be understood that some changes may be made in the arrangement and construction of the partsof my improved valve for internal combustion engines without departing from its essential features and purposes, and it is my intention to cover by this application any such changes which may be included within the scope of my claims.

I claim as my invention:

1. In a device of the class described, an engine cylinder, a valve chamber communieating therewith having side walls, inclined toward each other, the narrow side of said chamber being provided with an opening, and a boss surrounding said opening, a valve slidably mounted in said chamber, having inclined walls for engaging the inclined sides of the chamber and having a wall adapted to slide over said opening, and in engagement with said boss.

2. In a device of the class described, an engine cylinder, a valve chamber communicating therewith, having side walls inclined toward each other, the narrow side of said chamber being provided with an opening and a boss surrounding said opening, a valve slidably mounted in said chamber, having inclined walls for engaging the inclined sides of the chamber, and having a wall adapted to slide over said opening and in engagement with said boss, a valve stem slidably mounted in the wall of said chamber and operatively connected with the valve to allow some play of the latter, and means for yieldingly holding said valve toward the narrow side of said chamber.

3. In a device of the class described, an engine cylinder, a valve chamber communicating therewith, having side walls inclined toward each other, the narrow side of said chamber being provided with an opening and a boss surrounding said opening, a valve slidably mounted in said chamber having inclined walls for engaging the inclined sides of the chamber and having a wall adapted to slide over said opening, and in engagement with said boss, a valve stem slidably mounted in the wall of said chamber and operatively connected with the valve to allow some play of the latter, means for yieldingly holding said valve toward the narrow side of said chamber, a stem on said valve slidably mounted in the wall 'of said valve chamber, and means for imparting reciprocating motion t0 said stein.

f1. In a device of the class described, an engine cylinder, a valve chamber communieating therewith, having side walls inclined toward each other, the narrow side of said chamber being provided with an opening, and a boss surrounding said opening, a valve slidably mounted in said chamber, having inclined walls for engaging the inclined sides of the chamber and having a wall adapted to slide over said opening and in engagement with said boss, a piston in said cylinder, a shaft, means for imparting rotary motion to said shaft from said piston, a stem slidably mounted in the wall of said valve chamber, a link pivoted to said stem outside the valve chamber, and means for reciprocating said link Jfrom said shaft.

Des Moines, Iowa, April 15, 1915.

JOSEPH B. MARVIN.

Witnesses:

G. T. IMHorr, L. A. EisELL.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington. D. G. 

